// just follow the code for H- bridge inverter with pic in bult PWM controllers for genrating sine wave inverters
#ifndef _XTAL_FREQ
#define _XTAL_FREQ 16000000
#define __delay_us(x) _delay((unsigned long)((x)*(_XTAL_FREQ/4000000.0)))
#define __delay_ms(x) _delay((unsigned long)((x)*(_XTAL_FREQ/4000.0)))
#endif
#include
__CONFIG(PROTECT&
HS& //INTIO& //internal
OSC_8MHZ&
WDTDIS&
MCLRDIS&
PWRTEN &
BOREN &
0x3FFF);
unsigned char sin_table[32] = {0, 25, 49, 73, 96, 118, 137,
159, 177, 193, 208, 220, 231, 239, 245, 249, 250, 249, 245,
239, 231, 220, 208, 193, 177, 159, 137, 118, 96, 73, 49, 25};
unsigned char index;
unsigned char soft_start_sh; //soft start shift count.
unsigned char soft_start_td; //soft start time delay.
unsigned int DUTY_CYCLE; //delay.
bit soft_start, wave_flag = 0;
void interrupt siva() {
if (TMR2IF == 1) {
TMR2IF = 0;
CCPR1L = 200; //sin_table[index];
// ++index;
if(index == 32)
{ index = 0;
wave_flag = ~wave_flag;
if( wave_flag) CCP1CON = 0x8D; //half bridge control
else CCP1CON = 0x8C; //half bridge control
}
}
}
void main() {
ANSEL = 0; //Disable ADC
CM1CON0 = 0; //Disable Comparator
CM2CON0 = 0; //Disable Comparator
VRCON = 0;
PR2 = 249; //16 khz@16MHZ
TRISC = 0x3F;
CCP1CON = 0x00;
ECCPAS = 0x40;
PWM1CON = 0x94; //5ussec
PRSEN = 1;
CCP1CON = 0x8D; //half bridge control
wave_flag = 0;
__delay_ms(500);
TMR2IF = 0;
T2CON = 0x24; //TMR2 on, prescaler and postscaler 1:5
while (TMR2IF == 0);
TMR2IF = 0;
TRISC = 0x03; //set pwm pins as o/p
TMR2IE = 1;
GIE = 1;
PEIE = 1;
RC2 = 0;
RC3 = 0;
while (1) {
if (ECCPASE) index = 0;
}
}
PWM1A,1B,1C,1D pins form the H bridge circuit. IR2110 and IRF 740 MOS FETS are Used for circuit.
